Answer: The percent higher is 41.68%. If 49 planes were selected, 20 of them should be above 15 years.
To find the percent, we first need the z-score.
(15 - 13.5) / 7.3 = 0.21
Now, use a normal distribution table to find the percent above a score of 0.21. It will be 41.68%.
To find the number of 49 planes above this value, multiply 49 by 0.4168. You will have about 20.4 planes.
The 2 angles are complemantary or form right angles so
so
. Plugging that into BDC we get 11
The answer to this question is B!
Answer:
x=19/4 , y=3/4
Step-by-step explanation:
